export function addClass(el,className){
  if(hasClass(el,className)){
    // console.log(123)
    return
  }

  let newClass=el.className.split(" ")
  newClass.push(className);
  el.className=newClass.join(" ")
}

export function hasClass(el,className){
  let reg = new RegExp("(^|\\s)"+className+"(\\s|&)")
  return reg.test(el,className)
}